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<strong class="sidebar-title">开始使用</strong><a href="intro-to-liquid.html" class="sidebar-link">Liquid 简介</a><a href="setup.html" class="sidebar-link">安装</a><a href="options.html" class="sidebar-link">选项</a><a href="render-file.html" class="sidebar-link">文件渲染</a><a href="partials-and-layouts.html" class="sidebar-link">引用/继承</a><a href="use-in-expressjs.html" class="sidebar-link">Express.js 中使用</a><strong class="sidebar-title">高级主题</strong><a href="caching.html" class="sidebar-link">缓存</a><a href="register-filters-tags.html" class="sidebar-link">注册标签/过滤器</a><a href="access-scope-in-filters.html" class="sidebar-link">过滤器里访问上下文</a><a href="parse-parameters.html" class="sidebar-link">参数解析</a><a href="render-tag-content.html" class="sidebar-link">渲染标签内容</a><a href="sync-and-async.html" class="sidebar-link current">同步和异步</a><a href="whitespace-control.html" class="sidebar-link">换行和缩进</a><a href="plugins.html" class="sidebar-link">插件</a><a href="operators.html" class="sidebar-link">运算符</a><a href="truthy-and-falsy.html" class="sidebar-link">真和假</a><strong class="sidebar-title">其他</strong><a href="migrate-to-9.html" class="sidebar-link">迁移到 LiquidJS 9</a><a href="changelog.html" class="sidebar-link">更新日志</a><a href="differences.html" class="sidebar-link">与 Shopify/liquid 的不同</a><a href="contribution-guidelines.html" class="sidebar-link">贡献指南</a>
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<h1 class="article-title" itemprop="name">同步和异步</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/zh-cn/tutorials/sync-and-async.md" class="article-edit-link" title="改进这篇文档"><i class="icon-pencil"></i></a>
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<p>LiquidJS 支持同步调用也支持异步调用，支持 Promise。为了同异步复用一套标签和过滤器，LiquidJS 标签用生成器来实现。</p>
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<h2 id="同异步-API" class="article-heading"><a href="#同异步-API" class="headerlink" title="同异步 API"></a>同异步 API<a class="article-anchor" href="#同异步-API" aria-hidden="true"></a></h2><p><a href="/api/classes/liquid_.liquid.html">Liquid</a> 上主要的方法都支持同步和异步，下面这些方法返回 <code>Promise</code>：</p>
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<ul>
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<li><code>render()</code></li>
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<li><code>renderFile()</code></li>
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<li><code>parseFile()</code></li>
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<li><code>parseAndRender()</code></li>
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<li><code>evalValue()</code></li>
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</ul>
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<p>它们的同步版本带一个 <code>Sync</code> 后缀：</p>
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<ul>
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<li><code>renderSync()</code></li>
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<li><code>renderFileSync()</code></li>
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<li><code>parseFileSync()</code></li>
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<li><code>parseAndRenderSync()</code></li>
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<li><code>evalValueSync()</code></li>
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</ul>
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<h2 id="如何实现兼容同步的标签" class="article-heading"><a href="#如何实现兼容同步的标签" class="headerlink" title="如何实现兼容同步的标签"></a>如何实现兼容同步的标签<a class="article-anchor" href="#如何实现兼容同步的标签" aria-hidden="true"></a></h2><h3 id="要求" class="article-heading"><a href="#要求" class="headerlink" title="要求"></a>要求<a class="article-anchor" href="#要求" aria-hidden="true"></a></h3><p>所有内置标签都兼容同步，可以安全地用于同步或异步 API。为了让你的自定义标签页支持同步，你的标签不能返回 <code>Promise</code>，这意味着你的 <code>render(context, emitter)</code> 函数：</p>
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<ul>
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<li>不能直接 <code>return <Promise></code>，</li>
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<li>也不能声明为 <code>async</code>。</li>
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</ul>
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<blockquote class="note info"><strong class="note-title">不兼容同步的标签</strong><p>不兼容同步的标签也仍然是合法标签，在异步 API 下也会正常运行。被同步调用时，返回 <code>Promise</code> 的标签会被渲染成 <code>[object Promise]</code>。</p>
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</blockquote>
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<h3 id="等待-Promise" class="article-heading"><a href="#等待-Promise" class="headerlink" title="等待 Promise"></a>等待 Promise<a class="article-anchor" href="#等待-Promise" aria-hidden="true"></a></h3><p>但 LiquidJS 是支持 <code>Promise</code> 的，你仍然可以调用返回 <code>Promise</code> 的方法并等它 resolve。只需要把 <code>await</code> 换成 <code>yield</code> 并保留 <code>* render()</code> 不要改成 <code>async render()</code>。例如：</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
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<span class="token comment">// Usage: {% upper "alice" %}</span>
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<span class="token comment">// Output: ALICE</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function-variable function">parse</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>tagToken<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>str <span class="token operator">=</span> tagToken<span class="token punctuation">.</span>args
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token operator">*</span> <span class="token function-variable function">render</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 同步调用时 `ctx.sync == true`，`_evalValue()` 会同步地执行</span>
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<span class="token keyword">var</span> str <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token keyword">this</span><span class="token punctuation">.</span>liquid<span class="token punctuation">.</span><span class="token function">_evalValue</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>str<span class="token punctuation">,</span> ctx<span class="token punctuation">)</span>
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<span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>见这个 JSFiddle：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/6/">http://jsfiddle.net/ctj364up/6/</a>。</p>
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<h2 id="只支持异步的标签" class="article-heading"><a href="#只支持异步的标签" class="headerlink" title="只支持异步的标签"></a>只支持异步的标签<a class="article-anchor" href="#只支持异步的标签" aria-hidden="true"></a></h2><p>对于只用于异步 API 的标签，或者只能实现为异步的标签，使用生成器语法和 async 语法并没有区别。</p>
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<p>例如，如果上面的 <code>this.liquid._evalValue()</code> 不会检查 <code>ctx.sync</code> 而且总是返回一个 <code>Promise</code>，那么即使这个标签用 <code>* render()</code> 和 <code>yield this.liquid._evalValue()</code> 实现，最终也会渲染成 <code><object Promise></code>。</p>
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<p>这时可以直接使用 async 语法。注意有些 LiquidJS API 会返回 <code>Promise</code>，有些会返回生成器。你需要用 <a href="/api/modules/liquid_.html#toPromise">toPromise</a> API 来把生成器转换为 <code>Promise</code>，比如：</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken<span class="token punctuation">,</span> toPromise <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
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<span class="token comment">// Usage: {% upper "alice" %}</span>
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<span class="token comment">// Output: ALICE</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function-variable function">parse</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>tagToken<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>str <span class="token operator">=</span> tagToken<span class="token punctuation">.</span>args<span class="token punctuation">;</span> <span class="token comment">// name</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function-variable function">render</span><span class="token operator">:</span> <span class="token keyword">async</span> <span class="token keyword">function</span><span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">var</span> str <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">toPromise</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>liquid<span class="token punctuation">.</span><span class="token function">_evalValue</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>str<span class="token punctuation">,</span> ctx<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token comment">// Or use the alternate API that returns a Promise</span>
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<span class="token comment">// var str = await this.liquid.evalValue(this.str, ctx);</span>
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<span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>见这个 JSFiddle：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/5/">http://jsfiddle.net/ctj364up/5/</a>。</p>
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<time class="article-footer-updated" datetime="2022-10-17T18:41:30.019Z" itemprop="dateModified">上次更新：2022-10-17</time>
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<a href="render-tag-content.html" class="article-footer-prev" title="渲染标签内容"><i class="icon-chevron-left"></i><span>上一页</span></a><a href="whitespace-control.html" class="article-footer-next" title="换行和缩进"><span>下一页</span><i class="icon-chevron-right"></i></a>
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<strong class="sidebar-title">目录</strong>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%90%8C%E5%BC%82%E6%AD%A5-API"><span class="toc-text">同异步 API</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%A6%82%E4%BD%95%E5%AE%9E%E7%8E%B0%E5%85%BC%E5%AE%B9%E5%90%8C%E6%AD%A5%E7%9A%84%E6%A0%87%E7%AD%BE"><span class="toc-text">如何实现兼容同步的标签</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A6%81%E6%B1%82"><span class="toc-text">要求</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%AD%89%E5%BE%85-Promise"><span class="toc-text">等待 Promise</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%8F%AA%E6%94%AF%E6%8C%81%E5%BC%82%E6%AD%A5%E7%9A%84%E6%A0%87%E7%AD%BE"><span class="toc-text">只支持异步的标签</span></a></li></ol>
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<a href="intro-to-liquid.html" class="mobile-nav-link">教程</a><a href="../tags/overview.html" class="mobile-nav-link">标签</a><a href="../filters/overview.html" class="mobile-nav-link">过滤器</a><a href="../playground.html" class="mobile-nav-link">演示</a><a href="../api/classes/liquid_.liquid.html" class="mobile-nav-link">API</a>
|
||
</ul>
|
||
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||
<div class="mobile-sidebar-list">
|
||
<strong class="mobile-nav-title">开始使用</strong><a href="intro-to-liquid.html" class="mobile-nav-link">Liquid 简介</a><a href="setup.html" class="mobile-nav-link">安装</a><a href="options.html" class="mobile-nav-link">选项</a><a href="render-file.html" class="mobile-nav-link">文件渲染</a><a href="partials-and-layouts.html" class="mobile-nav-link">引用/继承</a><a href="use-in-expressjs.html" class="mobile-nav-link">Express.js 中使用</a><strong class="mobile-nav-title">高级主题</strong><a href="caching.html" class="mobile-nav-link">缓存</a><a href="register-filters-tags.html" class="mobile-nav-link">注册标签/过滤器</a><a href="access-scope-in-filters.html" class="mobile-nav-link">过滤器里访问上下文</a><a href="parse-parameters.html" class="mobile-nav-link">参数解析</a><a href="render-tag-content.html" class="mobile-nav-link">渲染标签内容</a><a href="sync-and-async.html" class="mobile-nav-link current">同步和异步</a><a href="whitespace-control.html" class="mobile-nav-link">换行和缩进</a><a href="plugins.html" class="mobile-nav-link">插件</a><a href="operators.html" class="mobile-nav-link">运算符</a><a href="truthy-and-falsy.html" class="mobile-nav-link">真和假</a><strong class="mobile-nav-title">其他</strong><a href="migrate-to-9.html" class="mobile-nav-link">迁移到 LiquidJS 9</a><a href="changelog.html" class="mobile-nav-link">更新日志</a><a href="differences.html" class="mobile-nav-link">与 Shopify/liquid 的不同</a><a href="contribution-guidelines.html" class="mobile-nav-link">贡献指南</a>
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</div>
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||
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||
</div>
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<div id="mobile-button-list">
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<a href="https://github.com/harttle/liquidjs" class="mobile-nav-link" rel="external" target="_blank"><i class="icon-github"></i></a>
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<a href="https://opencollective.com/liquidjs" class="mobile-nav-link" rel="external" target="_blank"><i class="icon-opencollective"></i></a>
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<div id="mobile-lang-select-wrap" class="mobile-nav-link">
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<label for="mobile-lang-select"><i class="icon-network"></i></label>
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<select id="mobile-lang-select" data-canonical="tutorials/sync-and-async.html">
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<option value="en">English</option>
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<option value="zh-cn" selected>简体中文</option>
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</select>
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</div>
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</div>
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</nav>
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<script src="../../js/main.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script>
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<script>
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document.getElementById('search-input-wrap').classList.add('on');
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docsearch({
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apiKey: '01f36cc168657a26a385308b9e721bc6',
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indexName: 'liquidjs',
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inputSelector: '#search-input',
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debug: false
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||
});
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</script>
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</body>
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</html> |